Have been running Sophos HomeEdition v8 for some time with daily updates working as expected (thanks Sophos for making a slick product available to us!).
Got the latest 3/14/2013 Mac OS security update (http://support.apple.com/kb/HT5672), went to install and it failed.
After trying again following a clean reboot with as many extensions/packages turned off/disabled as possible (including Sophos on-access scanning turned off, etc), it still failed noting the file may have been corrupted.
The update failure left finder repeatedly restarting itself -- couldn't open a window in it for more than 2-3 seconds. Luckily, I was able to run terminal (have it on my Dock) and use it to uninstall auto-run 3rd party software. With removal of each one (BoxCryptor, Dropbox, etc) I'd try the MacOS update again, and it continued to fail even with just Sophos HE as the only third-party product left running.
Uninstalled SophosHE, and re-ran the update again (yet another full download of the 333MB update file) and the MacOS update finally worked. Finder no longer restarted repeatedly and I was able to reinstall my other apps too.
Just an FYI for others with "older" hardware (e.g. either not 10.7/10.8 capable, or 10.710./8 just too slow -- my situation).
Running 10.6.8 on core-2 duo Macbook w/ 4GB DDR2 ram.
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